Process and apparatus for drying and conditioning materials.



W. W. SIBSON & T. ALLSOP. PROCESS AND APPARATUS FOR DRYING AND c'omnmowmc MATERIALS.

APPLICAHON FILED ]ULY2B,1913. RENEWED JUNE 20.1916.

Patented Jan. 23, 19117.

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7 SHEETS W. W. SIBSON & T. ALLSOP. PROCESS AND APPARATUS FOR DRYING AND CONDITIONING MATERIALS;

APPLICATION FILED JULY28,1913 RENEWED JUNE 20.1916. Lgllgfi wu A Patented Ja11.23,1917.

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PROCESS AND APPARATUS FOR DRYING AND CONDITlONlNG MATERIALS. APPLICATION FILED JULYZB. 1913. RENEWED JUNE 20.1916.

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W. W. SIBSON (IL I. ALLSOP.

PROCESS AND APPARATUS FOR DRYING AND CONDITIONING MATERIALS.

APPLICATION FILED .IULYZ8, I913- RENEWED JUNE 20.1916.

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Patented Jan. 28, I917.

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W. W. SIBSON & T. ALLSOP. PROCESS AND APPARATUS FOR. DRYING AND CONDITIONING MATERIALS.

APPLICATION FILED JULY28, 1 913. RE HEWED JUNE 20. 1916.

Patentm Jan. 23,191?

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PROCESS AND APPARATUS FOR DRYING AND CONDITIONING MATERIALS.

APPLICATION FlLED IULYZB. 191s. RENEWED JUNE 20. L916.

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PROCESS AND APPARATUS FOR DRYING AND CONDITIONING MATERIALS. APPLICATION FILED IULYZB. I913. RENEWED JUNE 20. 1916.

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WALTER W. SIBSON AND THOMAS ALLSOP, OF PHILADELPHIA, PENNSYLVANIA,

ASSIGNORS TO THE PHILADELPHIA DRYING MACHINERY COMPANY, OF PHILA- DELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

PROCESS AND APPARATUS FOR DRYING AND CONDITIONING MATERIALS.

Specification of Letters Patent.

Patented a... as, rare.

Application filed July 28, 1913, Serial No. 781,465. Renewed June 20, 1916. Serial No. 104,803. I

To all whom it may concern:

Be it known that we, WALTER W. SIBSON and TnoMAs ALLsor, of the city and county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Processes and Apparatus for Drying and Conditioning Materials, whereof the following is a specification, reference being had to the accompanying drawings.

()ur invention relates more particularly to a process and apparatus for drying and conditioning yarns or the like, wherein the moisture is driven off or removed from the yarn The more or less sensitive cellular structure of the yarn when subjected to a cooling blast contracts, drawing the fibers close together and resulting in some cases in forming a sort of skin on the exterior of the yarn, v

which renders the yarn less susceptible to the softening influence of the moist atmosphere to which it is subjected inthe conditioning compartment. 7,

An object of our invention is to provide a process of drying and conditioning yarn, wherein the same, after being dried by being subjected toheated air, is subjected to a con ditioning atmosphere without being exposed to a cooling blast of air.

An object of our invention is to provide a process of drying and conditioning yarn, wherein the same after being dried is immediately subjected'to a tempering atmosphere which maintains the yarn in a soft condition throughout, and from the said tempering atmosphere the yarn immediately passes to the conditioning atmosphere/ where the.

proper amount of moisture is supplied to the A further ob ect of our invention is to provide an apparatus consisting of connected compartments, through which the yarn may be passed in succession, which compartments are so constructed that the yarn is first subjected to circulating heated air where it is dried; after which the yarn is immediately subjected to a tempering atmoisture is removed, after which the air is.

passed to the conditioning compartment and utilized in forming a conditioning atmosphere.

A still further object of our invention is to provide an apparatus of the above charactor, in which each compartment has a separate circulating means and also a by-pass, whereby a portion of the circulating air may be shunted from one compartment to the next adjacent one from the conditioning compartment toward the drying one.

These and other objects will in part be obvious, and will in part be hereinafter more fully described.

In the drawings, Figure I, is a view in side elevation, showing our improved apparatus. Fig. II, is a top plan view of the same. Fig. III, is an enlarged plan View of one end of the apparatus, certain parts being in horizontal section. Fig. IV, is a sectional view on the line IV-IV, of Fig. I. Fig. V, is a sectional'View on the line V-V of Fig. I. Fig. VI, is a sectional view on the line VIVI of Fig. II. Fig. VII, is a. sectional view on the line VII-VII of Fig.

I. Fig. VIII, is a longitudinal vertical sectional view through one end-of the apparatus. Fig. IX, is a transverse sectional view through the tempering compartment. Fig. X, is a top plan view with certain parts in section, shdwing a slightly modified form of the apparatus. Fig. XI, is a longitudinal sectional view of the same as indicated at XI-XI, in Fig. X.

Our invention consists. generallyin providing a process of drying materials, and more especially yarn, wherein the yarn is passed successively through a drying com partment,."thence immediately to a temperng compartment, and thence immediately to a conditioning compartment. The drying compartment'is heated, and -means.are

provided for causing a circulation of air, so that the heated air will absorb the moisture from the wet yarn, and the yarn vis thus dried. This air loaded with moisture, in

our preferred form of apparatus, is carried V to a condenser, wheremthe molstjure is for v a greater part separated from the air; The

air which still contains some moisture, is thence tied to a conditioning compartment, wherein the atmosphere is properly condl- 'tionedfor supplying the yarn with moisture. "Between the conditioning compartment and the drying compartment, the yarn Y passes through the tempering compartment,

as above noted, and in the tempering compartment there 1s a circulation of air, which may be'slightly -moist and slightly warm,

. so as to keep the 'yarminsoft condition. If

" off-skin on the exterior surface of .the yarn,

the'yarn, after leaving the drying compart'- ment, is subjected to a blast of cold air, the outerv fibers'are contracted, forming a sort which renders it less susceptible to the moist passsfrom the drying compartment to the 'conditloning compartment. From}. certaln' atmosphere during the conditioning process. ,One of the essential features of our proc-.

'ess, and also of our improved'apparatus, is

this tempering compartment, which maintainsthe yarn-in proper condition as it aspects ofthe invention, however, the tempering' compartment may be made in fact one with the conditioning compartment; that is to say, the conditioning of the yarn may be carried out in several compartments,

,and these compartments will be connected and also connected to the drying compart ment, so that the yarn or material will be L Referring-more in detail to the-drawin s,

I compartment 5 which is a--,conditioiiingcom- '60 is a tempering-compartment 50.'

passed from-the drying compartment to the conditionlng compartment without being ex-. posed to any cooling,air currents.

we'will describe one form of apparatus] or carrying out our improved process, and the pro'cess'will be made clear from an understanding ofthe apparatus. Said apparatus .consistsof an-inclosed casing 1', 1 which is div ded by partitlons into various compartpartment. Between the partitions); and-6 The drying :compartrdent 3, may be sub- "i divided-by a partition 2, and theconditlonl gcompartment 5, may also be subdivided by apartiti on'fl lFig. 'VII, of the drawings showsa cross sectional view through the drying compartment. .Theskeins of yarn to be dried aref indicated in this figure at 'These' skeins are supported by rods or poles 8, which are carried through the inclosure by an endless conveyer indicated conventionallyin broken lines at 9, Fig. I. These rods 8, rest on angle bars 10, as they pass through the inclosure.

A longitudinal partition11 .divides the heating compartment,- so' as to provide means whereby the air may be circulated in the compartment. This partition is formed with circular openings in which are located fans 12. The partition is also formed with an opening 13, adjacent the-lower end there- 7 of. is drawn through the opening 13;

' thence through the-chamber 14, in which are located'h'eating coils 15. The air then passes.

through the fans 12, over thetop of the yarn, and a baflle plate 16, aids in distributmg air throughout the heating ordrying' compartment. The-heated air then passes through and about the yarn and again to the opening 13, and is thus caused to circulate through and about the yarn 'to be dried.

This baffle plate 16, distributesthe drying medium uniformly throughout the compartment; While we have shown a plate for this purpose, it will be understood that other means maybe used for breaking up the force of the; air currents, and distributing the 1 same in a uniform manner throughout the material being treated.

The amount of .heat-supphedto the air may be properly regulated, so. that the yarn in passmg throu h the drying compartment will be substantially freed. from moisture or water.

The chamberl i, in which the coils are lo cated is separated by a partition 17, so as to form a passageway 18, through which a portion' of the moisture-laden air is conveyed by means of a fan 19, to a pipe 20' (see Fig.

V), which is connected with acondenser 21, (see Fig. VI). The condenser 21, i s'provided with coils 22, through which water,

may be passed for condensing the moisture from the air. Baflle plates 23, and; 24,'catch the condensation and direct it toward a pipe 25, which maybe used for thepurpose of.

drawin off the condensej water.. If, how--' ever, t is condensation contains materials which'forreasonsof economy mightbe re-. covered, the pipe 25, may be connected. with yany' well' knownap aratus for this purpose 1. Anppening 26, eads to the atmosphere, and" a portion ofthe air drawn fromthedry- 1 'ing'compartment-may be thls opening,' if desired. hewater passing ssed out through through thecoils 22, becomes heated, and may be used in connection with other devices After the greater part of the moisture has'been separated' from the air, the air other side of the partition.

fan 28. The conditioning compartment is. also sub-divided by a partition 7, as above noted. Alongitudinal partition 29, divides the conditioning compartment, so the air may be caused to circulate therein. This partition hasan opening in which is located the fan 28, and also an opening 30, adjacent the bottom of the partition, so that the air is permitted to circulate through the conditioning compartment.

The conditioning chamber at one side of the partition 7, is connected to the conditioning chamber at the other side by a by-pass 31 (see Figs. III and VIII). A portion of the air circulating in the first conditioning chamber will, therefore, be caused to pass through into the conditioning chamber on the other side of the partition 7, and this conditioning chamber is similarly constructed, and a fan 32, causes a circulation therein.

It is sometimes desirable to heat the conditioning compartment, and we have, therefore, provided a heating coil 33, which may be used for supplying the air with suficient heat to aid in the forming of the proper conditioning atmosphere. It is understood, however, that this heat is not sufficient to dry the yarn to any extent The temperature of the coils 33, may be controlled by a thermostat .34, located in the conditioning compartment and connected by suitable means to a valve 35, controlling-the supply of heating fluid to the coils 33.

The yarn=as above noted, in passing from the drying compartment to the conditioning compartment passes through the tempering compartment. This tempering compartment is also divided by a longitudinal partition 36, in which are located openings 37, and

fans 38, disposed in the openings 37, cause the air to circulate in and about said tempering compartment. The conditioning. compartment is connected with the tempering compartment by a by-pass 39. The tempering compartment 50, communicates with the drying compartment 3, by means of a by-' passetO, which allows a portion of the air circulating at one side -of the partition 6, to pass into the drying compartment at 'the A by-pass in the partition 2, serves as a communication for shunting a portion of the air between too two compartments of the'drying chamber 3. Therefore, it will be apparent that wehave provided means whereby 'the air circulating in the conditioning compartment may be conducted in part to the tempering compartment, and thence to the drying compartment. I

.through the apparatus.

The pipe 27 leading frond the condenser to the conditioning compartment is provided with an opening 41, which is controlled by a valve 42, and this valve is connected by suitable means to a thermostat 43, which may be so regulated as to supply fresh air to the conditioning compartment, as desired.

lVhile the compartments are separated by 1 cross partitions, these crosspartitions are provided with openings which permit the skeins of yarn to pass from one compart ment to the other. Swinging curtains 44,, may be used in connection with the yarn skeins (see Fig. IX), and these curtains, to-

gether with the skeins of yarn, serve as a means for dividing the compartments from each other. It will be understood that other means may, however, be used for separating the compartments one from another, and for permitting the free travel of the yarn through the partitions.

The. fans for the different compartments are mounted on suitable shafts extending through the side wall of the inclosure, and these shafts are driven by belts 45, which are connected to suitable driving means. It will be understood that the speed of the belts may be varied as desired, so that the yarn may be caused totravel either slower or faster through the drying and conditioning apparatus.

In Fig. I, of the drawings, we have shown a conveyer 46, which may be used for-conveying the rods or poles, which support the yarn, back to the front end of the machine after the skeins of yarns have been removed therefrom.

By the above description, it will be apparent that we have provided a drying and conditioning apparatus, wherein the yarn 1 5.

the yarn, and the circulating air may be heated to the desired temperature for prop erly drying the yarn. The yarn is then no passed to a tempering compartment, wherein it is kept sufiiciently moist and Warm to prevent the undue drying o-r hardening of the outer fibers, after which the yarn is passed to aconditioningcompartment wherein it is supplied with the proper amount of moisture for conditioning and softening the same. These compartments are substantially closed so that the yarn as it, passes is kept free from cooling blasts of air. I

The air passing from the drying compartment is led through a condenser wherein the greater portion of the moisture in the air isv removed, and the air still retaining some moisture is utilized for forming a conditioning atmosphere for the yarn..- Furthermore, the air in the conditioning compartment is caused to pass through into the tempering compartment, and thence to the drying com- L, partment, and this aids in supplying proper .side of one of the fans, inthe tempering compartment.- By this connection of the tempering compartment with the ipe 27;,

we are able to supply additional moisture to." the tempering. compartment, under the. con

- trol'of a damper 48.

y In the handling of certain grades bf 11.1.1.

"twines, it is found that ifthey are handled and dried under the, same conditions as other yarns, the tensile strength thereof is decreased.- The outside layers .dry much more'rapidly than'the .inside layers, and

there is evidently considerably more tension onthe outside threads than on the wet ones which are inside. -By'our modified form-of apparatus, the air in the tempering compartment may be so regulated thatthe outside fibers of the material being dried may not become bone dry, and pull away from the fibers at the interior of "the threads. In other words, by our modified form of drying apparatus, the yarn may bedried in an atmosphere which can be so regulated as to maintain practically any desired condition of humidity.

,- Ifis sometl es desirable to supply the conditioning compartment with additional moisture, and we have, therefore, provided in our'modified,.form of apparatus, an atomizer .49, which may be of "any suitable. 7 construction, and by means of which water may be supplied to the air passing into the This atomizer.

conditioning compartment. is of'particular' value when the machine has .been shut down for sometime, as it may be fused to properly regulate the conditions until they'arn is again being delivered under normal conditions. In this case, the

' heating coilin the. conditioning compel-t f" adaptec l: --for the usd of, such volatile sub-' ment may be used iorheating the air which in order to increase; its capac1ty'.to' absorb additional quan ities is ,being. circulated of moisture.

- It has been mas-b. mamas.

an atmosphere that contains certain volatile substances, such as alcohol, benzine, turpena tine, etc., as such atmospheres are more favorable for softening the texture and keeps in open the pores or cells of the. material being, treated. .These vdlatile substances stances,"-a s it is substantially a closed'sys- Th yolatile substances may be recov- The created atmosphere I bein v2. The processofdryin and c the condenser 21, may be further used in drying, temperin and conditioning the matrial. I Then again in the practice heretoforeithas been customa large volumes of the ot, moist atmosphere 'circulates and recirculates and. the volatile substances not removed by condensation in from the drying compartment, while by Your process and apparatus a certain portion 'of such atmosphere is returned and recirculated which permits of a higher -,s'team economy. e

wide range of adjustment, so that the yarns V dried may be subjected to the proper conditions, both as to moisture and heat, and that the resulting drying of the yarn is similar to the natural drying under most favorable conditions. 1

Our improved process consists, therefore, in the subjecting of the .yarn or material to 'Our apparatus is capable of a'relatively:

be dried, to heated air at a relatively high 1 temperature, after which the'material is immediately subjected to air which is warm,

and a relatively low temperature," whereby the material being dried is tempered and ce'tible to'moisture. 4

, e process further consistsin the.ut1]iz-=- maintained-in proper condition, so that ing of the air passing from the dr 'ng com-" partment, .Jafter has passed t rougha; condenser for removing a greater portion";

of the moisture, for forming a proper moist 10 atmosphere forthe conditioning of the yarn.

- While. we have referred to-and described our 'device'as especially-adapted for drymg" yarn, it will be understood we have used this term in the broad'sense, and that our ap-i.

other'purposes- Having'thus claim:

1. The process of'drying and condition- )ing yarn, which consists in subjecting the "yarn while loosely supported to, adrying atmosphere and subsequently to a moist con-.

ditioning atmosphere without exposing the dried yarnto'cooling air currents. .1

the'y'arn to warm air at a relative y. low' temperature without exposing the dried yarn paratus and processare equally adapted for I described our invention, we

lit

treating some classes-of materials to provide ya which conslsts m p j m the yarn I Iv I .while loosely supptirted-to heate air ata f relatively high temperature, then-subjecting the yarnto a moist. air for conditioning th same and also-without'exposing the yarnto p cooling air currents. 3. The recess of drying and conditioning material, which consists in subjecting the-material .whileloosely suspended to a drying atmosphere and subsequently to a moist cond'tioning atmosphere without ex-- .to exhaust or waste posing the dried material to cooling air currents.

4. The process of drying and conditioning material which consists in subjecting the material while loosely suspended to heated air at a relatively high temperature, then subjecting the material to Warm air at a relatively low temperature without exposing the dried material to cooling air cur- .suspending the material and passing the same through said inclosure, partitions for separating said inclosure into a drying compartment and a conditioning compartment, whereby the material to be dried and conditioned may be passed directly from the drying compartment to the conditioning compartment and whereby said material is subjected to a drying and conditioning air while loosely suspended in'said compartment.

. 6. A drying and conditioning apparatus comprising an inclosure, means for passing the material through said inclosure, partitions for separating said inclosure into a drying compartment and a conditioning compartment, whereby the material to be dried and conditioned may be passed directly from the drying compartment to the conditioning compartment, means for circulating the air in each compartment, and means for passing the air from the drying compartment through a condenser and thence to the conditioning compartment.

7. A drying and conditioning apparatus comprising an inclosure, means for passing the material through said inclosure, partitions for separating said inclosure into a drying compartment, a tempering compartment and a conditioning compartment, whereby the material to be dried and conditioned may be passed directly from the drying compartment through the tempering compartment to the conditioning compartment, means for circulating the air in each compartment, means for shunting a portion of the air in the conditioningcompartment into the tempering compartment, and means for shunting a portion of the air in the tempering compartment into the drying compartment, and means for passing the air from the drying compartmentinto the conditioning compartment.

8. A drying and conditioning apparatus comprising an inclosure, means for passing .the material through said inclosure, partitions for separating said inclosure into a "drying compartment, a tempering compartment and a conditioning compartment,

whereby-thamat'erial to be dried and conditioned may be passed directly from the drying compartment through the tempering compartment to the conditioning compartment, means for circulating the air in'each compartment, means for shunting a portion of the air in the'conditioning compartment into the tempering compartment, and means for shunting a portion of the air in the tempering compartment into the drying compartment, and means for passing the air from the drying compartment through a condenser and thence to the conditioning compartment.

9. A drying and conditioning apparatus comprising an inclosure, means for passing the material through said inclosure, partitions for separating said inclosure into a drying compartment, a tempering compartment and a conditioning compartment, whereby the material to be dried and conditioned may be passed directly from the drying compartment through the tempering compartment to the conditiomng compartment, means for circulating the air in each compartment, means for shunting a portlon of the air in the conditioning compartment into the tempering compartment and means for shunting a portion of the air in the tempering compartment into the' drying compartment, means for passing the air from the drying compartment through a condenser and thence to the condition ng compartment, and means for controlllng the admission of extraneous air to the apparatus.

v10. A drying and conditioning apparatus comprising an inclosure, means for passlng the'material through said inclosure, part1- tions for separating said inclosure 1111303 drying compartment, a temperlng compartment and a conditioning compartment, wherebythe material to be dried and conditioned may be passed directly from the drying compartment through the tempering compartment to the conditioning compartment, means for supplying heated air to the drying compartment, means for causing a circulation of air in each of said compartments, means whereby a portion of the air circulating in the conditiomng'compartment may be shunted into the tempering compartment, and whereby a portion of the air the materialthrough' said inclosure, partitions for separating said inclosure 'intq' a drying compartment, a tempering compart-'.

ment, and a conditioning compartment, whereby the material to be dried and conditioned may be passed directly from the drying compartment through the'tempering drying compartment through the tempering compartment to the conditioning compartment, means for supplying .heated air to the drying compartment, means for circulatinglthe air in each compartment, and

means for passing the'air from the drying compartment throu h' a condenser an thence to the conditloning compartment. 12. A drying and conditioning .appara tus comprising an inclosure, means for passing the materlal through said 'inclosure,"

partitions for separating said inelosure into .a drying compartment, a tempering compartment and a conditioning compartment,

whereby the'material to be dried and con-X ditioned may be passed directly "from the drying compartment through the tempering mostatic means 'for automatically controlling the admission of extraneous air to the apparatus. I p

13. A drying and conditioning apparatus comprising an-inclosure, means for passing thematerlal through said inclosure, parti-' tions for separating" said inclosurej into a drying compartment, a tempering compartment and? a] conditioning compartment,

whereby. the material to be dried and conditioned may. bepassed directly from the --compartment' to. the conditiomng-compartf ment, means for supplying heated air to the drying compartment, means for circulating the air in each compartment,-means' for passing the .air. froni the drying com-' partment through-a condenser and thence ;to the conditionmg compartment, and so.

compartment may be heated.

means whereby the air in the conditioning 14, ;A drying and conditiomng apparatus comprising an inclosu're, means 'forpassing the material through said inclosure,"partiment. and .a: conditioning compartment, whereby the material to be dried and con- "diti ned may be passed directly from' the drying compartment through the tempering compartment to the conditioning compart ment, means for supplying heated air to the dryln compartment, means for circulating the airfin each compartment,- means for passing the air from the drying compart-v drying compartment, a tempering compartment through a condenser aiid'thence to the conditioningcompartment, and an atomizer whereby" the air passing to the conditioning j compartment maybe supplied with moisture.

:15. A drying and conditioning apparatus comprising an inclosure, means for passing the :material through said inclosure, partitions for. separating said .mclosure mto a ment and a a conditioning compartment, whereby the materialjto bedried and conditioned may be passed directly from'the drying compartment through the tempering compartment to the conditioning compartment, means for supplying heated air to. the. drying compartment, means for d1v1ding each compartment, whereby the air therein maybe caused to circulate, means located in each compartment forcausing'the air'to circulate, a by-pass connecting each of the compartments, whereby a portion of.

the air circulatingin the. conditioning com partment may be shunted .to the tempering compartment, and wherehy a portion of the air circulating in the temper-mg compartment-may be shunted to the vdrying. 'comp'artment. p i 16.-A drying-and conditloning apparatus comprisingjan lnclosure, means for passing. the material th oligh said -inclosure,-

artitions, for sepa ating said inclosure compartment and a conditioning compartfln't a drying conllhartment, a tempering ment, whereby the" material'- to be dried and conditioned may be. passed directly;-

from the drying compartment through the,

tempering. compartment to f the conditioning com artment, means for supplying a heated alr to the drying compartment, means for. dividing "each I compartment,-

-whereby the air therein mayfbe caused to circulate, means located in each-compartment for causing the air to-circulate, a

by-pa'ss connecting each of the compare ments, whereby-a portlon ,ofthe" air circulating in the conditioning compartment may be shunted to the. tempering compartment, and whereby .a portion of theair circulating in the" tempering -compartlnen't .may be shunted to the drying compartment, and means whereby the air circulating 1n the.

drying compartment may be -led through a o condenser to the conditioning compartment. tions for separating said mclosure into a 1 drymg compartment, a tempering'compart I 17;; A dryingand conditioning apparatus tempering compartment and .a. nditi n.. .ing compartment, whereby the material tobe dried and conditioned may be passed directly fromthe' drying compartment through comprising an incl'osure,'; means for passing 1 the material through said inclosure,v part1- tionsffor separating said inclosureinto' a the tempenng'compartment to the condinaraaee tioning compartment, means for dividing each compartment, whereby the an therem may be caused to circulate, means located in each compartment for causing the air to circulate, a by-pass connecting each of the compartments, whereby a portion of the air circulating in the conditioning compartment may beshunted to the tempering compartment, and whereby a portion of the air circulating in the tempering compartment may be shunted to the drying compartment,

means whereby the air circulating in the drying compartment may be led through a conditioning atmosphere in a substantially closed apparatus which atmosphere is charged with a volatile substance, such as alcohol, benzin or turpentine.

19; The process of drying and conditioning materials, which consists in subjecting the materials to a heated air charged with alcohol, benzin, turpentine or the like, pass- Witnesses:

ing the air from the materials through a condenser for removing a portion of the moisture and utilizing the air from the condenser for conditioning the materials, said materials after being dried being subjected to the conditioning atmosphere without being exposed to cooling air currents. I

20. A drying and conditioning apparatus comprising an inclosure, means for passing the material through said inclosure, partitions for separating said inclosure into a drying compartment and a conditioning compartment, whereby the material to be dried and conditioned may be passed directly from the drying compartmentto the conditioning compartment, means for circulating the air in each compartment, and automatic means for controlling the temperature of the air in the conditioning" com partment.

In testimony whereof,'we have hereunto sig ed our names at Philadelphia, Pennsyl- Vania, this twenty-fifth day of July, 1913.

. WALTER WV.v SIBSON.

' THOMAS ALI SOP.

JAMES H. BELL, E. L. FULLERTON. 

